JPH05237698A - Device for adjusting crank shaft angle of press - Google Patents

Abstract

PURPOSE:To unnecessitate an expensive slow-speed revolving device by adjusting crank shaft angle by revolving an adjusting screw shaft by a prescribed amount through a connecting rod. CONSTITUTION:In the state that the rotation of a crank shaft 1 is stopped and a brake unit for applying braking force to the crank shaft is released, a slide 3 is locked by a slide locking means. By revolving the adjusting screw shaft 5 between the slide 3 and connecting the rod 4, the crank shaft 1 is turned by applying a pushing-up (lowering) force to a eccentric part 2 from the side of the rod 4. The expensive low-speed revolving device is unnecessiated and the crank shaft 1 can be accurately and rapidly adjusted by a prescribed angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crankshaft angle adjusting device for a press. Particularly, it is a device in which power is applied from the connecting rod side while the slide is locked to rotate the crankshaft by a predetermined angle.

[0002]

2. Description of the Related Art A general structure of a power press is shown in FIG.
In the figure, reference numeral 1 denotes a crankshaft having eccentric portions 2 and 2, which is rotatably held in a crown (not shown).
Numeral 3 is a slide, which is an eccentric portion 2 via connecting rods 4 and 4.
It is connected to 2. 10 is a bolster. Also, 1
A main motor 4M is connected to the drive shaft 11 via a flywheel 13 and rotates the crankshaft 1 via a gear train 12 including a main gear 12G.

In such a press, the brake device 16 is turned off.
When FF (released) and the clutch device 15 are turned ON (engaged), the crankshaft 1 is rotated by the rotational energy accumulated in the flywheel 13, whereby the slide 3 can be vertically stroked in a constant curve slide motion. .. On the other hand, the clutch device 15 is turned off (separated)
If the brake device 16 is turned on (brake),
The crankshaft 1 can be stopped rotating. The same applies to the case of the integrated clutch / brake device. Here, the relationship between the rotation angle of the crankshaft 1 and the position of the slide 3 is determined by the slide motion curve.

Further, when exchanging the mold, the bottom dead center position of the slide 3 must be adjusted to change the setting of the die height DH shown in FIG. This is performed by the slide position adjusting device (die height adjusting device) shown in FIG. That is, the slide position adjusting device has a male screw 5a to be engaged with the female screw 4a of the connecting rod 4, and has a spherical body 6 at the lower end thereof.
Adjusting screw shaft 5 integrally provided with the worm wheel 8 (vertical groove 8h) rotatably mounted on the slide 3,
The worm screw shaft 9 is rotated by an adjusting motor (not shown). The spherical body 6 and the worm wheel 8 are connected by inserting a pin 7 fixed to the spherical body 6 into the vertical axis 8h. 3B is a spherical bearing.

Therefore, if the adjustment screw shaft 5 is rotated by manually and automatically rotating the adjustment motor, the vertical relative position between the crankshaft 1 and the slide 3 whose axis is unchanged can be changed. You can adjust the die height DH.

By the way, in the slide motion of such a power press, the slide speed changes greatly in the press working area. Therefore, in the case of performing drawing work, in order to make the speed change slow, for example, JP-B-49-3416. By providing the Whitworth mechanism disclosed in the publication and adjusting the relative angle between the crankshaft (1), that is, the eccentric portion (2) and the main gear (12G) connected by the link, the so-called link motion is changed. There is. Further, in order to make the slide stroke length variable, for example, a multilayer eccentric structure proposed in JP-A-59-92200 and JP-A-3-216296 is provided, and the eccentric part (2) and the eccentric part (2) are provided. It is formed so as to change the combined eccentricity amount with the eccentric bush mounted and fitted. Further, in order to change the knockout timing of the knockout device, the mounting angle of the knockout cam is adjusted as disclosed in Japanese Utility Model Laid-Open No. 3-31030.

Here, the relative angle between the eccentric part (2) of these Whitworth mechanism and the main gear (12G), the relative angle between the eccentric part (2) of the multi-layer eccentric structure and the eccentric bush,
The relative angle of the knockout cam with the crankshaft (1) is
This is performed by rotating the crankshaft (1) by a predetermined angle in a state where the corresponding members are once separated, and then re-joining the corresponding members.

In principle, the crankshaft 1 may be rotated by using the main motor 14M with the clutch device 15 shown in FIG. 7 turned on and the brake device 16 turned off. However, it is not possible to accurately position and control the crankshaft 1 with a large-capacity main motor 14M via the components (13, 15, 11, 12) of large inertia, for example, a very small relative angle such as 5 degrees. It is extremely difficult.

Thus, conventionally, a special slow-speed rotating device is generally provided and the crankshaft 1 is rotated by a predetermined angle.

[0010]

However, in the conventional slow rotation device, for example, a worm wheel mounted in the brake device 16, a worm screw meshing with the worm wheel, a dedicated motor connected to the worm screw, and a rotation thereof. Since it is composed of a control device, there is also a layout problem that it is difficult to install it in the crown, which not only increases the cost but also increases the packaging density. Furthermore, even if such a slow rotation device is used, it has become difficult to accurately control each of the relative angles described above, which is much more accurate.

SUMMARY OF THE INVENTION An object of the present invention is to provide a crankshaft angle adjusting device for a press, which can adjust the crankshaft by a small predetermined amount easily and accurately and can reduce the cost.

[0012]

According to the present invention, a slide position adjusting device including a small-pitch adjusting screw shaft is mounted as an essential component of a press, and a crankshaft (eccentric part), a connecting rod, and a slide are provided. Focusing on the functional coupling of the above, by fixing the slide by reversing the idea and rotating the adjusting screw shaft, the rotational power is transmitted from the connecting rod side to the crank shaft to achieve the above object. It is a thing.

That is, the crankshaft angle adjusting device for a press according to the present invention is provided with a slide position adjusting device which connects the crankshaft and the slide via a connecting rod and includes an adjusting screw shaft between the connecting rod and the slide. And a slide lock means for locking the slide so that the slide cannot move up and down on the condition that the crankshaft is stopped rotating, and the slide lock means locks the slide. In addition, the adjustment screw shaft is rotated by a predetermined amount so as to rotate the crank shaft by a predetermined angle via the connecting rod, provided that a brake device for applying a braking force to the crank shaft is released. The adjusting screw shaft rotation control means is provided.

[0014]

According to the present invention having the above-described structure, when the crankshaft is stopped by stopping the press, the slide lock means is locked to disable the vertical stroke movement of the slide.
Here, the adjusting screw shaft rotation control means is activated to rotate the adjusting screw shaft by a predetermined amount. Then, the vertical relative position between the connecting rod and the slide tends to change. However, since the slide is locked, the connecting rod consequently pushes or pulls down the eccentric. That is, the crankshaft can be rotated by a predetermined angle to adjust the angle. Therefore, the rotation angle of the crankshaft can be accurately and quickly adjusted based on the small pitch of the adjusting screw shaft and the like. Moreover, since the slide position adjusting device can also be used, the cost can be significantly reduced as compared with the case where a special conventional slow rotating device is provided.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 3, the present crankshaft angle adjusting device includes slide lock means (40, 50) and adjusting screw shaft rotation control means (50), and slides with the slide (3) locked. The adjustment screw shaft (5) forming a part of the position adjusting device is rotated to apply rotational power to the eccentric portion (2) from the connecting rod (4) side, whereby the crank shaft (1) can be rotationally adjusted by a predetermined angle. Is configured.

The purpose of using the present crankshaft angle adjusting device can be applied to any of the slide motion setting change, the slide stroke length setting change, the knockout timing setting change, etc., but is not particularly limited. , Whitworth mechanism in this embodiment (60)
The description will be made for the purpose of changing the setting of the slide motion using.

Thus, the press of this embodiment has the same basic structure as that of the conventional example (see FIGS. 7 and 8), but in addition to this, as shown in FIG. 1, the Whitworth mechanism 6 is used.
0 and a coupling / separating means 20 are provided. The same components as those in the conventional example are designated by the same reference numerals, and the description thereof will be simplified or omitted.

First, the wit worm mechanism 60 and the coupling / separating means 20 will be described. In FIG. 1, a main gear 12G that forms a gear train 12 together with a drive gear 11G that is integral with the drive shaft 11 is fitted and mounted on the crankshaft 1 via a bush 1B. The main gear 12G itself is rotatable relative to the crankshaft 1. An encoder 1E is attached to the crankshaft 1.

Here, the Whitworth mechanism 60 includes a link (lever) 61 fitted and mounted on the crankshaft 1,
Eccentric sheave 62 rotatably inserted in this link 61
And a pin 63 for connecting the eccentric sheave 62 and the main gear 12G. The link 61 and the crankshaft 1 are connected by meshing an internal gear 61G integral with the link 61 and an external gear 1G integral with the crankshaft 1 via a connecting gear 21G integral with the jaw 21. To be done.

On the other hand, the coupling / separating means 20 is the jaw 2
1 and the jaw moving means 30 for reciprocating the jaw 21 in the left-right direction in FIG. The jaw moving means 30 includes a lever 34 rotatably supported on the machine frame 19 by a pin 33, a cylinder device 31 connected by a pin 32, a rotatably mounted end of the lever 34, and a jaw 21. And a roller 35 fitted in the groove 22.

Therefore, when the coupling solenoid 31S is excited by the signal CNG shown in FIG. 3 to actuate the cylinder device 31 so that the piston rod 31P projects rightward in the drawing, the lever 34 moves the pin 33 in FIG. The jaw 21 (21G) is rotated in both gears 1
It can be moved in the direction of coupling to G and 61G (leftward in FIG. 1). At this time, the connecting gear 21G and the both gears 1
When the gears G and 61G are not in the complete meshing position, the coupling gear 21G is driven by the urging force of the cylinder device 31 to both gears 1G.
G, 61G is pressed. That is, when the crankshaft 1 is rotated during the pressing state to reach the meshing position, the connecting gear 21G moves to both gears 1G and 61G.
Further, the meshing link 61 and the crankshaft 1 can be automatically and integrally connected. The connected state can be confirmed by the cam switch 25 shown in FIG. 3, which is turned on when the jaw 21 moves leftward in the drawing.

Therefore, the coupling / separating means 20 (21, 3)
1) is set in the separated state, the crankshaft 1 is rotated by a predetermined angle to change the relative angle between the main gear 12G and the crankshaft 1, that is, the link 6 between the two 12G, 1
If the posture of No. 1 is changed and then the coupling / separation means 20 is brought into the coupled state, the motion of the slide 3 is shown by a solid line, a two-dot chain line in FIG. 6 even if the rotation speed of the drive shaft 11 is kept constant.
The settings can be changed as shown by the dotted line. Since the Whitworth mechanism 60 is publicly known, further description will be omitted.

Here, slide lock means (4) forming a part of the present device for rotating the crankshaft 1 by a predetermined angle.
0, 50) is composed of a lock mechanism 40 formed by a cylinder device 41 and a pressing piece 43 fixed to the tip of the piston rod 42 by a screw (44) and a control section (50), as shown in FIG. Has been done. As shown in FIG. 3, the control unit outputs a signal FF described later when it is confirmed that the crankshaft 1 is stopped rotating. In this embodiment, the control unit is also used as the press operation control device 50. .. 3G
Is a gib fixed to the machine frame 19 (column). Therefore, if the pressing piece 43 and the gib 3G are positioned and arranged in the same plane, the slide 3 can be slidably guided in the vertical direction in the normal state, but as shown by the two-dot chain line in FIG. If it is projected, the slide 3 can be locked so that it cannot move vertically. In addition, this lock cylinder device 41
Can excite the pressing piece 43 by exciting the solenoid 41S shown in FIG. 3 with the signal FF.

On the other hand, adjusting screw shaft rotation control means (50)
The structure is not particularly limited as long as the adjusting screw shaft 5 shown in FIG. 1 can be driven to rotate by a predetermined amount, but in this embodiment, a slide position adjusting device (pin 7, worm wheel 8, worm screw shaft 9, The driver 9D shown in FIG.
The components (for example, CPU, RO) of the press operation control device 50 of FIG. 3 that drive-controls the adjustment motor 9M) and the entire press.
(M, RAM, etc.) and their functions are combined for construction.

That is, the adjusting screw shaft rotation control means (5
0), the slide 3 is locked by the slide lock means (40, 50), and the brake device 16 (FIG. 7).
On the condition that is turned off, the rotation signal R is output to the driver 9D to rotate the adjusting screw shaft 5 by a predetermined amount.

By the way, as shown in FIG. 3, the press operation control device 50 itself turns on the signal Sbl when the operation signal STR is input by pressing the operation button 51.
To excite the brake solenoid 16S and send the signal Sc
r is turned on to excite the clutch solenoid 15S,
Press operation is started by turning off the brake device 16 and turning on the clutch device 15. When the stop button 52 is pressed, the clutch device 1 is operated based on the stop signal STP.
5 is turned off and the brake device 16 is turned on to stop the press. After the press is stopped, both the brake device 16 and the clutch device 15 are turned off to operate this device.
It is supposed to be able to.

In addition, the press operation control device 50 is shown in FIG.
A rotation angle signal θ of the main gear 12G is input from an encoder 18 for detecting a main gear angle, which is connected via a gear 17 meshing with the main gear 12G shown in FIG. Also,
The signal SP is applied to the driver 14D of the main motor 14M to rotate the main motor 14M. In FIG. 3, reference numeral 55 is a mode selection switch for driving the apparatus, 56 is a coarse angle setting device, and 57 is a fine angle setting device.

In this embodiment, the press operation control device 50 stops the press by setting the crankshaft 1 at 270 degrees, for example. That is, the eccentric portion 2 is stopped so as to be horizontal so that the push-up (pull-down) force from the connecting rod 4 side can be effectively used. In addition, when changing the slide motion, the main motor 14M, that is, the main gear 12G is rotated at a very low speed by a large part of all the rotation angles of the crankshaft 1 required for that, that is, the angle (θstp) set by the coarse angle setting device 56 (see FIG. It is assumed that the crankshaft 1 is rotated in advance by performing ST13 of 4). By doing so, the rotation angle of the adjusting screw shaft 5 of the present apparatus, that is, the angle set by the fine angle setting device 57 (θ
The value of set) can be reduced.

The reason for this is that the main motor 14M (main gear 12) that cannot be stopped at a predetermined angle with high accuracy.
G) is used for rough adjustment, and then the high-accuracy adjustment screw shaft 5 is used for final alignment to enable quick slide motion changes as a whole and reduce the load on this device. At the same time, it is intended to truly develop its effectiveness. Therefore, it is needless to say that the present invention can be implemented even if it is configured to rotate all angles using only this device.

Further, in this embodiment, the bond separating means 2
0 (31), slide lock means (40), etc. are organically and serially controlled by a slide motion changing program shown in FIGS.

Next, the operation of this embodiment will be described. Figure 3
, The mode selection switch 55 is turned on to declare the slide motion change, and the press stop button 52 is turned on.
Then, the press operation control device 50 causes the clutch device 15 to operate.
Is turned off and the brake device 16 is turned on so that the crankshaft 1 becomes 270 degrees and the press is stopped (ST in FIG. 4).
10, 11). This 270 degree is performed with reference to the encoder 1E for crank angle detection.

Next, the press operation control device 50 turns off the signal CNG in FIG. 3 to deactivate the solenoid 31S of the coupling / separation means 20 (31). That is, the piston rod 31P of the cylinder device 31 of FIG.
4 is rotated to separate the jaw 21 to the right (ST1
2). Therefore, since the connecting gear 21G is disengaged, the gears 1G and 61G are disengaged.

Subsequently, the clutch solenoid 15S and the brake solenoid 16S are excited by the signals Scr and Sbl, and then the signal SP is output to the driver 14D to rotate the main motor 14M, that is, the main gear 12G at a slight speed (ST13). This rotation angle is the rough angle θstp set by the rough angle setting device 56 in advance. The rough angle θstp may be set to be slightly larger (smaller) than all the angles required for changing the slide motion. And ST
When the current value θi of the angle signal θ detected by the encoder 18 at 14 becomes equal to the rough angle θstp, the main gear 12G is stopped rotating (ST15).

Next, the press operation control device 50 excites the solenoid 31S of the cylinder device 31 of the coupling / separation means 20 with the signal CNG to cause the piston rod 32 to project. In this case, the connecting gear 2 of both gears 1G and 61G and the jaw 21
Since the positions of 1G and 1G do not match, these gears 1G, 61
G and 21G do not mesh, and the connecting gear 21G is
It is in a state of being biased to G and 1G (ST16).

Here, when the control section (50) forming a part of the slide lock means confirms that the crankshaft 1 is stopped rotating, it outputs a signal FF to the locking solenoid 41S shown in FIG. Excitation is performed, and the piston rod 42 of the lock cylinder device 41, that is, the pressing piece 43 is projected as shown by the chain double-dashed line. That is, the slide 3 is locked so that it cannot move vertically (ST17).

Then, the adjusting screw shaft rotation control means (50)
Outputs a signal R to the driver 9D to control the rotation of the adjustment motor 9M. Worm screw shaft 9, worm wheel 8,
The adjusting screw shaft 5 can be rotated in a predetermined direction via the pin 7 (ST18). Therefore, when the vertical relative position between the adjusting screw shaft 5 and the connecting rod 4 changes, the slide 3
Since it is fixed and locked, it pushes up (pulls down) to the eccentric part 2.
The crankshaft 1 can be rotated by applying force.

In this case, the crankshaft 1 is rotated by the fine angle setting device 57 shown in FIG. 3 with the angle θset set in advance as a target. The fine angle θset is slightly larger than the originally required value. When the gears 1G and 61G and the connecting gear 21G integrated with the jaw 21 reach the meshing position, the connecting gear 21G is automatically urged by the cylinder device 31, so that the external gear 1G and the internal gear 1G are automatically urged. It is connected to the gear 61G. The crankshaft 1 and the link 61 can be coupled and connected. That is, the slide motion change is completed by changing the relative angle between the crankshaft 1 and the main gear 12G. This is the cam switch 25 for moving the jaw 21.
It is confirmed by detecting with (ST19 of FIG. 5).

Thus, the adjusting screw shaft rotation control means (5
In 0), the rotation of the adjusting motor 9M is stopped (ST20), and then the signal CNG is turned off, the solenoid 31S is de-excited, and the pressing piece 43 attached to the cylinder device 41 is pulled in on the same plane as the give 3G, and slide locked. Is canceled (ST21).

According to this embodiment, however, the slide lock means (40, 50) and the adjusting screw shaft rotation control means (50) are provided, and the adjusting screw shaft 5 is rotated in the locked state of the slide 3. Since the crankshaft 1 is rotated by applying a push-up (pull-down) force from the connecting rod 4 side to the eccentric portion 2, an expensive conventional slow rotation device is unnecessary, and the crankshaft 1 can be accurately moved by a predetermined angle. An inexpensive and easy-to-handle crankshaft angle adjustment device that can be adjusted quickly can be established.

Further, since all the angles required for changing the slide motion are adjusted by the coarse angle due to the rotation of the main gear 12G and the fine angle due to the present apparatus, the amount of rotation of the adjusting screw shaft 5 is small and the burden on the corner is small.

Further, since the press operation control device 50 is formed so as to stop the press by setting the crankshaft 1 to 270 degrees, the crankshaft 1 is effectively utilized by utilizing the pushing (pulling) force from the connecting rod 4 side. Can be easily rotated.

The adjusting screw shaft rotation control means (50) and the like are constructed by using the slide position adjusting device (8, 9, 9D, 9M) and the press operation control device 50, which are essential components of the press. Therefore, the accurate rotation of the crankshaft 1 can be performed more inexpensively and more reliably.

Further, since the coupling / separating means 20 closely related to the Whitworth mechanism 60 and the device (40, 50) are organically and serially controlled, the slide motion can be changed automatically.

[0044]

According to the present invention, the slide lock means and the adjusting screw shaft rotation control means are provided, and the adjusting screw shaft is rotated in the locked state of the slide to push up (pull down) from the connecting rod side to the eccentric portion. Since the crankshaft 1 is rotated by applying force, an expensive conventional slow rotation device is unnecessary, and the crankshaft can be adjusted accurately and quickly by a predetermined angle. A device can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view mainly showing a mechanical structure of an embodiment of the present invention.

FIG. 2 is likewise a view for explaining a slide lock means.

FIG. 3 is likewise a block diagram for explaining adjusting screw shaft rotation control means.

FIG. 4 is likewise a flow chart (1) for explaining the operation.

FIG. 5 is also a flowchart (2) for explaining the operation.

FIG. 6 is a diagram for explaining a slide motion setting change.

FIG. 7 is a diagram for explaining a general configuration of a conventional press.

FIG. 8 is a cross-sectional view for explaining a slide drive device of a conventional press.

[Explanation of symbols]

1 crankshaft 1E encoder for crank angle detection 1G external gear 2 eccentric part 3 slide 3G give 4 connecting rod 5 adjusting screw shaft (slide position adjusting device) 8 worm wheel (slide position adjusting device) 9 worm screw shaft (slide position adjusting device) ) 9M adjusting motor (slide position adjusting device) 11 drive shaft 12G main gear 14G main motor 15 clutch device 15S clutch solenoid 16 brake device 16S brake solenoid 18 main gear angle detection encoder 19 machine frame 20 coupling / separating means 21 jaw 21G connecting gear 22 groove 25 cam switch 30 jaw moving means 31 cylinder device 31S coupling solenoid 31P piston rod 34 lever 35 roller 40 lock mechanism (slide lock means) 41 series Da device 41S Lock solenoid 43 Pressing piece 50 Press operation control device (slide lock means, adjusting screw shaft rotation control means) 51 Operation button 52 Stop button 56 Coarse angle setting device 57 Fine angle setting device 60 Whitworth mechanism 61 Link 61G Internal tooth gear 62 Eccentric sheave 63 pin

Claims (1)

[Claims] 1. A crankshaft angle adjusting device for a press, wherein a crankshaft and a slide are connected via a connecting rod, and a slide position adjusting device including an adjusting screw shaft is provided between the connecting rod and the slide. Slide lock means for locking the slide so that the slide cannot move up and down under the condition that the crankshaft is stopped rotating, and a brake device for locking the slide by the slide lock means and applying a braking force to the crankshaft. The adjustment screw shaft rotation control means for rotating the adjustment screw shaft by a predetermined amount so as to rotate the crank shaft by a predetermined angle via the connecting rod. Crankshaft angle adjustment device.